Common Application Design Considerations
This chapter covers the following topics:
- DNS
- HTTP/HTTPS
- FTP
- Instant Messaging
- Application Evaluation
I don't want to insist on it, Dave, but I am incapable of making an error.
Arthur C. Clarke, 2001: A Space Odyssey, 1968
The Answer to the Great Question . . . Of Life, the Universe and Everything . . . Is . . . Forty-two.
Douglas Adams, The Hitch Hiker's Guide to the Galaxy, 1979
Although this book will certainly not go into great detail on application security, in certain cases application security relies on the network for its overall security strategy. This chapter presents best practices for the deployment of e-mail, DNS, HTTP/HTTPS, and FTP. A short discussion on instant messaging (IM) and application security evaluations is also provided. The emphasis in this chapter is on network placement and filtering guidelines, not application hardening. In addition to these placement guidelines, be sure to follow the hardening steps in Chapter 5, "Device Hardening," and deploy host security controls as discussed in Chapter 4, "Network Security Technologies." Specific application security recommendations for these protocols can be found online or in any number of books, some of which are referenced in this chapter.
NOTE
The examples used in this chapter are focused on the firewall. The deployment of intrusion detection systems (IDS) and other security technologies is expected but not included because such technologies don't generally impact the logical topology of the network. Similar designs with all security components included (and multiple applications) are included in Part 3 of this book.
Part I. Network Security Foundations
Network Security Axioms
- Network Security Axioms
- Network Security Is a System
- Business Priorities Must Come First
- Network Security Promotes Good Network Design
- Everything Is a Target
- Everything Is a Weapon
- Strive for Operational Simplicity
- Good Network Security Is Predictable
- Avoid Security Through Obscurity
- Confidentiality and Security Are Not the Same
- Applied Knowledge Questions
Security Policy and Operations Life Cycle
- Security Policy and Operations Life Cycle
- You Cant Buy Network Security
- What Is a Security Policy?
- Security System Development and Operations Overview
- References
- Applied Knowledge Questions
Secure Networking Threats
- Secure Networking Threats
- The Attack Process
- Attacker Types
- Vulnerability Types
- Attack Results
- Attack Taxonomy
- References
- Applied Knowledge Questions
Network Security Technologies
- Network Security Technologies
- The Difficulties of Secure Networking
- Security Technologies
- Emerging Security Technologies
- References
- Applied Knowledge Questions
Part II. Designing Secure Networks
Device Hardening
- Device Hardening
- Components of a Hardening Strategy
- Network Devices
- NIDS
- Host Operating Systems
- Applications
- Appliance-Based Network Services
- Rogue Device Detection
- References
- Applied Knowledge Questions
General Design Considerations
- General Design Considerations
- Physical Security Issues
- Layer 2 Security Considerations
- IP Addressing Design Considerations
- ICMP Design Considerations
- Routing Considerations
- Transport Protocol Design Considerations
- DoS Design Considerations
- References
- Applied Knowledge Questions
Network Security Platform Options and Best Deployment Practices
Common Application Design Considerations
- Common Application Design Considerations
- DNS
- HTTP/HTTPS
- FTP
- Instant Messaging
- Application Evaluation
- References
- Applied Knowledge Questions
Identity Design Considerations
- Identity Design Considerations
- Basic Foundation Identity Concepts
- Types of Identity
- Factors in Identity
- Role of Identity in Secure Networking
- Identity Technology Guidelines
- Identity Deployment Recommendations
- References
- Applied Knowledge Questions
IPsec VPN Design Considerations
- IPsec VPN Design Considerations
- VPN Basics
- Types of IPsec VPNs
- IPsec Modes of Operation and Security Options
- Topology Considerations
- Design Considerations
- Site-to-Site Deployment Examples
- IPsec Outsourcing
- References
- Applied Knowledge Questions
Supporting-Technology Design Considerations
- Supporting-Technology Design Considerations
- Content
- Load Balancing
- Wireless LANs
- IP Telephony
- References
- Applied Knowledge Questions
Designing Your Security System
- Designing Your Security System
- Network Design Refresher
- Security System Concepts
- Impact of Network Security on the Entire Design
- Ten Steps to Designing Your Security System
- Applied Knowledge Questions
Part III. Secure Network Designs
Edge Security Design
- Edge Security Design
- What Is the Edge?
- Expected Threats
- Threat Mitigation
- Identity Considerations
- Network Design Considerations
- Small Network Edge Security Design
- Medium Network Edge Security Design
- High-End Resilient Edge Security Design
- Provisions for E-Commerce and Extranet Design
- References
- Applied Knowledge Questions
Campus Security Design
- Campus Security Design
- What Is the Campus?
- Campus Trust Model
- Expected Threats
- Threat Mitigation
- Identity Considerations
- Network Design Considerations
- Small Network Campus Security Design
- Medium Network Campus Security Design
- High-End Resilient Campus Security Design
- References
- Applied Knowledge Questions
Teleworker Security Design
- Teleworker Security Design
- Defining the Teleworker Environment
- Expected Threats
- Threat Mitigation
- Identity Considerations
- Network Design Considerations
- Software-Based Teleworker Design
- Hardware-Based Teleworker Design
- Design Evaluations
- Applied Knowledge Questions
Part IV. Network Management, Case Studies, and Conclusions
Secure Network Management and Network Security Management
- Secure Network Management and Network Security Management
- Utopian Management Goals
- Organizational Realities
- Protocol Capabilities
- Tool Capabilities
- Secure Management Design Options
- Network Security Management Best Practices
- References
- Applied Knowledge Questions
Case Studies
- Case Studies
- Introduction
- Real-World Applicability
- Organization
- NetGamesRUs.com
- University of Insecurity
- Black Helicopter Research Limited
- Applied Knowledge Questions
Conclusions
- Conclusions
- Introduction
- Management Problems Will Continue
- Security Will Become Computationally Less Expensive
- Homogeneous and Heterogeneous Networks
- Legislation Should Garner Serious Consideration
- IP Version 6 Changes Things
- Network Security Is a System
References
Appendix A. Glossary of Terms
Appendix B. Answers to Applied Knowledge Questions
Appendix C. Sample Security Policies
INFOSEC Acceptable Use Policy
Password Policy
Guidelines on Antivirus Process
Index
EAN: 2147483647
Pages: 249
